Impossible to send any prompt message to ChatGPT4 with my laptop

As a ChatGPT4 subscriber, I’ve been experiencing a major problem with my ChatGPT account for a few hours now: I can’t send prompts from my laptop. For information, I work on Google Chrome. I’ve restarted my laptop, deleted the cookies, logged out of my ChatGPT account and logged back in. The problem is still there. However, I can send prompts from my ChatGPT4 account via the ChatGPT application on my iPhone. Could you please help me solve my problem? Many thanks in advance for your help!